My intention is to make flog suitable for using in CI services. This PR allows to have all calculated methods and classes scores in corresponding instance variables. So they could be used for further calculations.

This looks fantastic... but you lost me at README.md. That has nothing to do with your functional changes to the code and honestly, I don't care about veneer. If you roll back the last two commits of the pull I'll happily merge the rest.

May be I was a lil bit fast with README but my point was that README should give any developer an example of how to use the gem (both in with Ruby code and command line), so I just added this example there. Nevertheless let's continue to work on flog, examples could be added later.